Tm doped NaBi(WO 4 ) 2 of good optical quality with sizes of about 20mm×20mm×40mm was grown successfully by the Czochralski technique. The absorption spectra for both σ- and π-polarizations were recorded at room temperature. Based upon these data, the oscillator strengths and radiative transition rates were evaluated. The σ- and π-polarized emission spectra together with the fluorescence decay curve were also obtained. The emission cross-section of the potential laser transition at 1460nm was determined to be 1.49×10 −19 cm 2 . The results show that Tm 3+ :NaBi(WO 4 ) 2 crystal is a promising laser material.